I had to go back to Preview_v1.0.5.4130 version as none of the more recent builds after that can load my music directory into playlist without crashing.
I tried doing fresh installs of v1.0.6.4220 and also the latest v1.0.7.4264, both had the same behaviour. Back to v1.0.5 and it loads the directory just fine. It's a folder with multiple subdirs and roughly 5000 mp3s, so not too big.
Attaching the error report that was generated from 1.0.7 release.